feat(api): Implemented session closed and kick event via websocket

knockoutwhistweb/app/events/UserEvent.scala

@@ -0,0 +1,12 @@
+package events
+
+import de.knockoutwhist.utils.events.SimpleEvent
+import model.users.User
+
+import java.util.UUID
+
+abstract class UserEvent(user: User) extends SimpleEvent {
+
+  def userId: UUID = user.id
+  
+}